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Title

Σύνθεση και χαρακτηρισμός χημικά εμπλουτισμένο ανηγμένου οξειδίου του γραφενίου με κάλιο για βελτίωση απόδοσης φωτοβολταϊκών κελιών περοβσκίτη

Alternative Title

Synthesis and characterization of potassium doped reduced grapheme oxide for performance enhancement of perovskite solar cells

Author

Ζήνα, Ευαγγελία

Thesis advisor

Κουτσολέλος, Αθανάσιος

Abstract

The present bachelor thesis was carried out in the laboratory of Nanomaterials & Organic Electronics of the Hellenic Mediterranean University of Crete. The present thesis was based on the synthesisis and characterization of doped graphene-based materials for use in photovoltaic devices. In the first part of this thesis, which covers the theoretical aspect of this work, the allotropic forms of carbon, and in particular the structure of graphene, the ways of its synthesis and the properties are described. Also, the method of preparing graphene oxide (GO) and reduced graphene oxide (RGO) from graphite and the following potassium (K) doping method are analyzed. In addition, some of their basic applications and the role of graphene derivatives in photovoltaic devices are analyzed. In the second part of this work, the technical methods used to characterize the graphene-based materials are analyzed. The third part consists of the experimental procedure followed, in the fourth part, by the presentation of the results from the characterizations of the materials and photovoltaic devices that were prepared and evaluated. The experimental procedure consisted of the synthesis of graphene oxide (GO) from graphite powder and the synthesis of reduced graphite oxide (RGO) by two different methods: 1) using hydrazine (N2H4) as a reducing agent and 2) using hydroiodic acid (HI) as a stronger reducing agent. The materials were then functionalised chemically with potassium hydroxide (KOH) to prepare graphene derivatives doped with potassium atoms (KGO and KRGOs). The final products, after complete characterization, were integrated in innovative perovskite photovoltaic devices (Perovskite Solar Cells, PSCs) with the aim of increasing their photovoltaic efficiency.

Language

Greek

Subject

Grapheme

Grapheme oxide

Hummers method

Perovskite Solar Cells (PSCs)

Photovoltaic

Potassium doping

Reduce grapheme oxide

Ανηγμένο οξείδιο του γραφενίου

Γραφένιο